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Hülle cell

Hülle cell is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Hülle cell rather than just read about it. In short: Eduard Eidam first described Hülle cells in 1883 where he termed Hülle cells as a "Blasenhülle" or bubble envelope (Eidam 1883). In different species, Hülle cell-like structures are known such as in Candida albicans which produce at the very end of the hyphae globose blisters named chlamydospores (Navarathna et al., 2016).

Hülle cell — main illustration
Hülle cell — illustration

Key takeaways

  • Hülle cell belongs to biology; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Hülle cell to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Hülle cell from memory before moving on to harder problems.

Reference excerpt

Eduard Eidam first described Hülle cells in 1883 where he termed Hülle cells as a "Blasenhülle" or bubble envelope (Eidam 1883). In different species, Hülle cell-like structures are known such as in Candida albicans which produce at the very end of the hyphae globose blisters named chlamydospores (Navarathna et al., 2016). Eidam suggested that Hülle cells originate from the tip of "secondary hyphae" which in turn emerge from "primary hyphae" and develop as a consequence of a swelling process. Hülle cells and the subtending hyphae are connected via two distinct types of septa. The inner one is a single perforate septum where woronin bodies can be observed and represents a typical ascomycetous septum. The second septum which separates Hülle cells from the subtending hyphae is unique and named basal septum. At the basal septum vesicle fusion is observable. Consequently, to this fusion so called lomasome-like accumulations are visible. These lomasome-like structures are membrane-invaginations. In Hülle cells several nuclei, mitochondria, lipid bodies and storage products can be observed (Ellis et al., 1973). During initial Hülle cell formation, it was shown that several nuclei fuse to form a marcronucleus (Carvalho et al., 2002). Different species of the genus Aspergillus produce Hülle cells, including Aspergillus nidulans and Aspergillus heterothallicus (Bayram and Braus 2012). Hülle cells have an average size of 12-20 μm, are of globose shape with an unusual thick cell wall and are mainly associated with the sexual developmental program. Hülle cells are known for all species in the section Nidulantes. In different species, Hülle cells vary in shape between the more elongated such as in Aspergillus ustus and the globose version like in Aspergillus nidulans. In Aspergillus nidulans and Aspergillus heterothallicus Hülle cells associate with the cleistothecia, whereas in Aspergillus protuberus and Aspergillus ustus Hülle cells are not in direct contact with the cleistothecia and are formed in masses (Muntanjola-Cvetkovic and Vukic).

References

Illustrations

Hülle cell: Hülle cells from a single cleistothecium. Scale bar is 10 μm[1]
Hülle cells from a single cleistothecium. Scale bar is 10 μm[1]

Worked examples

Example 1 — a first encounter with Hülle cell

Start with the simplest possible case. Write down what Hülle cell claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Hülle cell before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Hülle cell ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Hülle cell

In research
Hülle cell appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Hülle cell in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Hülle cell is common in secondary-school and first-year university syllabi. It links to neighbouring topics Candida (fungus), Cells, so understanding it makes those chapters shorter.
In everyday life
Look for Hülle cell outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Hülle cell in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Hülle cell means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Hülle cell out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hülle cell in simple terms?

Eduard Eidam first described Hülle cells in 1883 where he termed Hülle cells as a "Blasenhülle" or bubble envelope (Eidam 1883). In different species, Hülle cell-like structures are known such as in Candida albicans which produce at the very end of the hyphae globose blisters named chlamydospores (…

Why does Hülle cell matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Hülle cell?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Hülle cell.

Tags

  • Candida (fungus)
  • Cells

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